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Arpad 'Arki' Busson

Rex Features

Very rich, very generous and just so handsome. Call 53-year-old Arki a playboy if you like, but he's one of the original and most successful hedgies. Ah, you were referring to the laydees. To be fair, he's only had three 'officials' in 20 years: Uma Thurman, Elle Macpherson and Kristin Scott Thomas. The French-Swiss accent and crisp white shirts unbuttoned to the waist hide the fact his mother was actually a very English deb, Flockie Harcourt-Smith.

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Taki

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The spry Greek shipping heir has been dishing up the juiciest gossip from Gstaad, New York and the international yacht set in his Spectator column since 1977 (he funds his own libel suits), even keeping it going from Pentonville after smuggling cocaine through Heathrow. Aged 78, still loves karate.

The Fortes

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They could kick back with their £250m fortune, but this Italian-Scottish family just can't stop working damn hard. Sir Rocco, 71, runs 11 hotels (while his wildly popular sister, Olga Polizzi, is his design director and married to William Shawcross). His eldest daughter Lydia, 28, joined the firm two years ago after opening the Markham Inn in Chelsea. With his Italian wife Aliai, 51, and children Irene, 27, and Charles, 24, they're the best-looking family in church (they're devout Catholics).

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Mark-Francis Vandelli

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The fur-swathed, flicky-haired 26-year-old from Made in Chelsea hails from the loins of Marzio, an Italian tile heir, and Diane Boulting-Casserley Vandelli, a Russian princess who was an Yves Saint Laurent muse. Catch him at 5 Hertford Street - he's there four nights a week.

Lapo Elkann

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From Teddy Boys to the Tardy Book: What Eton was really like in the Good Old Days

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ByTatler

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Gianni Agnelli's rakish 38-year-old grandson ran Fiat for a time and once worked for Henry Kissinger. But his greatest contribution to mankind has to be his championing of the (sockless) blue-suede loafer and horn-rimmed spectacle, plus those outrageous lapels on his trademark double-breasted suits.

Luca del Bono

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After a period in New York, the massage-loving co-founder of Quintessentially has brought Turkish baths and Russian banyas to SW7 with his members-only South Kensington Club. Smooth, but not oily.

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VON EUROS

Von Westenholzes

Rex Features

Old German stock. Baron Piers von Westenholz is a former Olympic skier and a pal of the Prince of Wales. His son Fritz is the financier who's married to the Austrian stylist Caroline Sieber. At their wedding, in 2013, he said she was 'the best thing out of Austria since Mozart'. Terribly vitty, these Germans.

Von Bismarcks

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Descendants of the Iron Chancellor, a thickly moustached 19th-century Prussian statesman. These days, the patriarch is Bolle (rhymes with 'dollar'), who is married to Debonnaire, or Debbie. They're a party-loving pair who have four sons, including 28-year-old Nikolai - Kate Moss's young swain.

Von Preussens

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ByLuciana Bellini

This lot are Prussian royalty and still use the titles, although Prussia ceased to be a state in 1947. There are millions of cousins - including the illustrator Beatrice, 35, OKA stylist Florrie, 32, below right, and architect Tatiana, 36. To make things even more confusing, they're related to the Guinness and Wellington families. So they've done quite well at assimilating.

Von Trapps

Rex Features

You're thinking of The Sound of Music. Although to be fair, they were a real-life, fairly musical Austrian family who fled the Nazis and later settled in Vermont.

ROYAL EUROS

The Greeces

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Dividing their time between the Cotswolds and Chelsea, the Greeces are busy busy busy. There is her childrenswear (Marie-Chantal) brand, his work in equity funds and their love of hunting and sailing. Oh, and they have five children too. The eldest, Princess Maria-Olympia, 19, is currently studying at NYU and has been linked to Prince Harry.

The Casiraghis

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Hot, young and Monégasque royalty, the Casiraghis would be quite a catch if they weren't all taken - Andrea, 31, and Pierre, 28, are happily married (to heiresses Tatiana Santo Domingo and Beatrice Borromeo) and Charlotte, 29, has a young son with the Moroccan comedian Gad Elmaleh.

Princess Sasha Galitzine

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After studying art history in Edinburgh and spending time tracing her roots in St Petersburg, Sasha, 27, recently opened a pop-up gallery in Soho. Calls herself an 'art-food-people-life junkie'.

PARTY EUROS

Arthur de Soultrait

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Arthur is best known for his Versailles-themed 30th-birthday bash in Paris in 2012 - a shindig that involved dwarfs, strippers and him and a buddy pointing a toy gun at the paparazzi from their open-top car as they rushed their chum Pippa Middleton to the Gare du Nord the following morning. But the 34-year-old French vicomte is far, far more than ill-thought-out high jinks and pretend-weaponry: 'I shoot pheasants; I shoot partridge; I love shooting duck.'

Raimondo Gaetani d'Aragona Lovatelli

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The Italian count - 'Rai-Man' to his friends - was the mastermind, along with James Manero, behind what became the hippest techno party in East London at the beginning of this decade. Rai turned 28 in 2010 and, understandably, threw himself a small party - 800 peeps showed up. He then threw it again and again and again, under the witty name 'Another Party'. It quickly escalated into a heavily subscribed night: 'One in, one bloody out.' Surely it's time for yet another?

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Tony Bromovsky

Hugo Burnard

Count Tony Bromovsky, 67, has the funnest schloss in all Austria, where he hosts two types of weekend: family weekends (he has a beautiful wife and four children) that are all about good, wholesome entertainment, like swimming and tennis and cycling up mountains. And party weekends, which are all about the schnapps cellar and long nights. The rest of the time you'll find him in Wiltshire or London.

Alex Flick

Rex Features

The son of Countess Maya von Schönburg and billionaire Mercedes-Benz heir Mick Flick, handsome Swiss-born Alex, 30, is a documentary-maker who made his first film, The Magnolia Curtain, about one of the poorest towns in South Carolina. The Old Harrovian has an eight-year-old daughter with Google industry manager for fashion, Pia Stanchina, and relaxes in Ibiza or Gstaad.

Nina Flohr

Rex Features

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ByTish Weinstock

The daughter of Swiss aviation mogul and founder of VistaJet Thomas Flohr never stays put for long. Nina, 29, lives in Notting Hill, but zips between LA, where she works (as creative director of VistaJet) and surfs, and Benguerra, off Mozambique, where she's building a hotel and environmental conservation centre. In summer she invites a few VERY lucky friends, like Alice Naylor-Leyland, on her dad's £42m yacht.

Eduardo Teodorani-Fabbri

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Gentle, kind, tanned and huggable - Eduardo, part of the Fiat family, may be an Italian soft touch, but he takes no prisoners when it comes to partying. He does, however, take his girlfriends all over the world - from the Bahamas to Rome. Sadly, none of them have been able to get the fiftysomething to settle down. It could be you.

BURNING MAN EUROS

Federico Pirzio-Biroli

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A handsome, stubbly 31-year-old Belgian - 'Fed' to his friends - he runs his angel-investment office from London, but lets off steam with his sound system (the most powerful at last year's Burn, FYI) at the festival every year.

Constance Jablonski

Instagram/constancejablonski

The 25-year-old French model Instagrammed herself during sunrise at last year's Burn wearing a pair of goggles on her head. She calls it a 'special time with the most special friends'. #takemetotheplaya

Margherita Missoni

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It's a new era

ByHarriet Verney

The Italian fashion designer, 33, goes burning with Euro pals Eugenie Niarchos, 29, and Tatiana Santo Domingo, 32. 'Last year, the three of us came back to the real world, and we started functioning as three parts of a unity,' she said in a 2010 interview. 'At the festival, we started wearing matching outfits and we kept doing it afterwards. When people started questioning us about it, we said we were in a visual-art act called the Spice Burns.'

Michelangelo Bendandi

Instagram/michelangeloobee

This Italian thirtysomething smoothie works for Frieze, but come August will be found in the Nevada desert wearing an assortment of hats. Loves fancy dress. Once wore a pair of size-18 lace knickers from M&S as a cravat to a black-tie party.

DYNAMIC EUROS

Erik Torstensson

Rex Features

A 37-year-old Swede with a killer smile, he's the co-founder of the Saturday Group, a hugely successful marketing group behind some of the biggest fashion and entertainment campaigns in the past decade. Also happens to be Natalie Massenet's other half.

Christine D'Ornano

Rex Features

Eclairs, macarons, croissants - just some of the good things that come from France. Better yet, though, is Christine, 43, the international VP of Sisley. But the ravissante mother-of-three would rather bake muffins than French fancies at her W10 gaff.

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Freddy Van Zevenbergen

Rex Features

Freddy has the most beautiful maneof flowing blond hair this side of the Eighties. After five years under Nicky Haslam, he launched his own interior- design firm, Lambart & Browne. Makes cardboard models of country houses.